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31 lines
708 B
31 lines
708 B
package metricutil
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import (
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"errors"
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"fmt"
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"strings"
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)
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// SanitizeLabelName removes all invalid chars from the label name.
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// If the label name is empty or contains only invalid chars, it
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// will return an error.
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func SanitizeLabelName(name string) (string, error) {
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if len(name) == 0 {
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return "", errors.New("label name cannot be empty")
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}
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out := strings.Builder{}
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for i, b := range name {
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if (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0) {
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out.WriteRune(b)
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} else if b == ' ' {
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out.WriteRune('_')
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}
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}
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if out.Len() == 0 {
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return "", fmt.Errorf("label name only contains invalid chars: %q", name)
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}
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return out.String(), nil
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}
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